Question

Plis ada yg bisa no 1 ???? tolong ya...

Answer 1

Sayaa nggakkk bbisaa.

Answer 2

A. 9y^2+5xy+7x^2-3y^2-7xy-x^2
   = 7x^2-x^2+9y^2-3y^2+5xy-7xy
   = 6x^2+6y^2-2xy

b. (9x^2-12x+5)+(x^2-7x+6)
    = 9x^2-12x+5+x^2-7x+6
    = 9x^2+x^2-12x-7x+5+6
    = 10x^2-19x+11

c. (3a^2b+10ab^2-ab)-(2a^2b-12ab^2+4ab)
     = 3a^2b+10ab^2-ab-2a^2b+12ab^2-4ab
     = 3a^2b-2a^2b+10ab^2+2ab^2-ab-4ab
     = a^2b+22ab^2-5ab

keterangan ^= pangkat